From c5ba08133370f98de722c978bda3b446721985de Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Thu, 23 Jan 2014 13:33:00 +0100
Subject: [PATCH] nix-shell: Add --impure flag

This is currently the default, but I might change that to --pure in
the future.
---
 scripts/nix-build.in | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/scripts/nix-build.in b/scripts/nix-build.in
index 060b080897..168730bbc9 100755
--- a/scripts/nix-build.in
+++ b/scripts/nix-build.in
@@ -137,9 +137,8 @@ for (my $n = 0; $n < scalar @ARGV; $n++) {
         push @envExclude, $ARGV[$n];
     }
 
-    elsif ($arg eq "--pure") {
-        $pure = 1;
-    }
+    elsif ($arg eq "--pure") { $pure = 1; }
+    elsif ($arg eq "--impure") { $pure = 0; }
 
     elsif (substr($arg, 0, 1) eq "-") {
         push @buildArgs, $arg;